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Kwon, Il,Lee, Kyu Nam,Lee, Jung Kee,Pan, Jae Gu,Oh, Tae Kwang,Lee, Hyung Hoan,Yoon, Ki Hong 한국미생물 · 생명공학회 1995 Journal of microbiology and biotechnology Vol.5 No.4
A Brevibacterium flavum gene coding for glucose permease of the phosphoenolpyruvate-dependent phosphotransferase system (PTS) was cloned by complementing the Escherichia coli ZSC113 mutations affecting a ptsG gene with the B. flavum genomic library. From the E. coli clone grown as red colony on a MacConkey plate supplemented with glucose as an additional carbon source, a recombinant plasmid was isolated and named pBFT93. The plasmid pBFT93 was identified as carrying a 3.6-kb fragment of B. flavum chromosomal DNA which enables the E. coli transformant to use glucose or mannose as a sole carbon source in an M9 minimal medium. The non-metabolizable sugar analogues, 2-deoxy-D-glucose (2-DG) and methyl-α-D-glucopyranoside (MeGlc) affected the growth of ZSC113 cells carrying the plasmid pBFT93 on minimal medium supplemented with non-PTS carbohydrate, glycerol, as a sole cabon source, while the analogues did not repress the growth of ZSC113 cells without pBFT93. It was also found that both 2-deoxyD-[U^-14C]glucose and methyl-αa-D-[U^-14C]glucopyranoside could be effectively transported into ZSC113 cells transformed with plasmid pBFT93. Several in vivo complementation studies suggested that the B. flavum DNA in pBFT93 encodes a glucose permease specific for glucose and mannose.